Alpine 7279M User manual

JILPINE
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Digital Tuner Cassette
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7279M
“For the cassette deck mechanism parts (GT75B01B,,GT75BO1C) of this
model, refer to the GT Series Service Manual (Part No. 68P92539F02).”
Cassette Deck Mechanisms by Serial Numbers.
ta 7279M 7279L 7279E

7279M/L/E
Contents
Specifications ore rr ec reece etree teen eee eee een eee tenet eee e teen eet e neces ese terteet ten eeeeen eee eee neta aaas 2 to 3
Controls & Indications -r< ccc ec e ce ce ee EEE EE Ene eee nee e EEE EERE eee Eee nnn EE ett Hees 4
Connections errs rere eee nee ee en ee een EERE Eee Eee nen een e ee EEE Eee EEE ee eR Ene Ente nee eee e nents 5
Operation <2 rire rere ere eee eee erent eee eee este eee r tt eceer reer ener e rere rene res 5 to 6
Disassembly Instructions scrcc etc etter eee ene ett etter eee e teen cnt e nett nett enn eet e eerste see en es 7 to 8
Adjustment Procedures «c++ strc cet ere eects tee e nee ee rete eee ete e renee eee eens eters eae e nett eee eee enna teens 9 to 12
Adjustment Locations + +:+rttcretecrc eect ee ene eee ee rete eee e eee ne eee e eens e easter eeeee nee eeen enter eee steed 13 to 15
FM Tuner Schematic Diagram -cecceset cree cece eee ree tees tee e eee eee e nena eens eee e eee ee ener ernest reat eee eee eens 16
Block Diagram <crcettccce rete eter teen cette nee reece eee e eee ee eee e nest enene een eeeeaeeeeereneeesene ree erares 17 to 18
Parts Layout on P. C. Boards and Wiring Diagram (1/2) ccrcecce treet tte eet teen e eee eee ee sent teen tees 19 to 21
Parts Layout on P. C. Boards and Wiring Diagram (2/2) crcrrree ect r eter erent erent ent eee ene ne ene erees 22 to 24
Schematic Diagram (1/3) cceccccececec eects cence eres sees eneeennee sence scenes sree reese ees ee ners senate anes 25 to 27
Schematic Diagram (2/73) Pre ar eae rer ee 28 to 30
Schematic Diagram (3/3) <trccceec cece stent ener nett eee eee etree ene n eee eee nena nee nee ne er ee ene e es 31 to 32
Electrical Parts List eer eT ee rE ee ee ee Te ee Pe ee ee eRe ee rr er ee ey 33 to 42
Packing Assembly Parts List -:+ccctrec crc ece tec cec ences eee ee eens nee e nate nee e eee ee nena ete a ents neste eneteenees 43
Cabinet Assembly Parts List <cccctrecrccerre reece ener terete eee eee en tence teen ener nseen reer een e sees seer eeeennnns 44
Exploded View (Cabinet) -ccceetccecc eee eec tree eerste e nee n neces nena eee e ee ee ene e eee ee ene naan ners nese nees 45 to 46
Packing Method View «rscrecccecreccee ees ee ee ee ene e eee ee erent neces eee e nee e eee e eee eee ee nena eee ee enna eeeneees 46
Semi-conductor Lead Identifications «cccsce rece cece sent eee e eect eter neta een eee e eee e tenner eeeneee tree n ences 47 to 51
s oe s
Specifications
FM RADIO
Intermediate Frequency -reccec eter cee c teeter ee teen ene e eee n nent een e nee eee EE eee ee een en eee Eee EEE EEE Ee tes 10.7+0.1MHz
Frequency Range cccrcse tree cette eee e teen eee n eee eee teen ee een t ERE eee EERE eee a EEE EERE REE REDE EEE ES 87.5 to 108MHz
Usable Sensitivity (Stereo at O8.1MHz) vrrcrr sree reece e teeter eee e ence ence ences 19.2dBf (7279M/L Models Only)
17.2dBf (7279E Model Only)
Limiting Sensitivity (OB.1MHz) cerrtce terre errr terete reece cence eee ete e eens 14.2+5dBf (7279M/L Models Only)
S/N Ratio (Stereo 60dB up QB.1MHZ) creer errr rete r tte etree eect nent e eee ees 50dB (7279M/L Models Only)
48dB (7279E Model Only)
Image Rejection (at 106.1MHz) srr cette ree teen et ete terete eee ener eee n nn eee etn e ence etter eet e ee eeeernees 40dB
IF Rejection (at GQO.IMHz) secre cere e eee rere renee een enn ete e eee n een nett n ne cee nent ene ene nearer ene eee ene 60dB
Distortion (Input 1V at 98.1MHz) Poe ae ee aD 1%
Frequency Response (Ref. 400HZ) -rrrtert rrr t rr eres tree e seer eee ener eeeceees 80Hz: 0+3dB (7279E Model Only)
100Hz: O0+3dB (7279M/L Models Only)
10kHz: -—12+3dB
Stereo Separation (at 1,000Hz) ee meee eee ere ee mene rece near ener ese Sede esas ath ss Heres eseresereseneeneeeseeesese 25dB
AM RADIO (7279E Model Only)
Intermediate Frequency Cr rar aera a aa ee ee ee a er re rr re irr marr ar ar a rary 450kHz
Frequency Range Se ee aera eee aa eae ore eee ee 2a er 531 to 1,602kHz
Sensitivity 20dB S/N (at QOQKHz) recs teeter ete teen eee enna e een n etn e nent eee n en eet nena 45.2dBf
SiN “Ratio (at QOOKHZ) “estevs laweeeecanaen Sedeena dtaslaveatnae tet ad nals aa4% Widains oe hee eek tad beiees ohne 44dB
Image Rejection Cat 1,404kKHzZ) creer errr rete terete eee e erent ence eee n rete eee n eee n eee teense ene e ee eaetsetnns 44dB
IF’ Rejection: (at GOSKHz)) <i sscesecsedeck sce etae enna as cles aia a aed eee tt edieamededied eine dees sbabiigaweeeieledhe 60dB
Distortion Cat QGQKHz) -se cece eee e eect ere c nett ete tee eee tenet Ene EERE EEE REESE EEE HOES EEE e EEE EOE E DELETES 2%
Frequency ReSOpnse ores ttre reece eee ee een ener ene n een e ene e enn ee nnn ees ener EE een REE EES 100Hz: -3+5dB
4kHz: —12+5dB
S29.

7279M/L/E
MW RADIO (7279M.‘L Models Only)
Intermediate Frequency ee ee ee cs 450 +5kHz
Frequency Range vers r tert eter er etree ete ee nee e cence eee en eects eee teeta eet n tense tater ster esecene 531 to 1,602kHz
Sensitivity 20dB SAN Cat 999kHz) ea ara a rae 45.2dBf
S/N Ratio (at 999kHz) wee ee emer cee eee w eee n ewer eet O OO EEE Eee eee EE eee rere n aes eee sere rereennanene 44dB
Image Rejection (at 1,404kHz) ea ee a arr 45dB
IF Rejection (at 603kHz) i ii i i i i i 60dB
Distortion (at 999kHz) ic 1%
Frequency Response ee er a ee 100Hz: —3+3dB
4kHz: -—12+6dB
LW RADIO (7279M /L Models Only)
Intermediate Frequency «cers ce eset etter etree eect eee n ene e tate n esate eee e nee eee e ete e test ensee teen cs en eens 450+5kHz
Frequency Range cerctrcc cers ce tcc e ett e tee tee e eee e nen eet e ete g essen eeen nsec e rene t ee ceneeeaee en enes 153 to 281kHz
Sensitivity 20dB S/N (at 218kHz) serececeee reese eee ec neste et et eee ee eres ee renter nes 48.2dBf (7279L Model Only)
(at ZIGKHZ) verre cette cree cent e tent ee eee teen ence ene e reat ences 48.2dBt (72798M Model Only)
SYN Ratio Cat 2ISKHZ) ccrc errr tee re teen eee e ene e tee e een e ee en test ete te ee eaes 40dB (7279L Model Only)
(Cat QIGKHZ) creer cere tree eee eee e ene erent ete e eect eee te seer tect eats 40dB (7279M Model Only)
Image Rejection (at 272KHz) cece cree ete ete e tenet eet eee eect ete e tence eter e eee ees 40dB (7279L Model Only)
CAA LO) 40 2 eer 40dB (7279M Model Only)
IF Rejection (Cat 218KHz) -ccre cree eet e tee e eee eect net e tee ence ee eet en ee en et en eer e tees 50dB (7279L Model Only)
(at 216kHz) ee ee 50dB (7273M Mode] Only)
Distortion (at 400kHz) tae NevGvey A'S eis alee fa, 6 aS 6 e nab lacenereh ahe.w eBid ree 8. 646-8 8.GMEaw: alle: 0G: 6). wie TE wy niece ferare, 8:08 Wiese, Wigs Bie 858 oie 8 $2008 Sa 'e "918 ,6)1000, 700: 1.5%
Frequency Response ob. 0: Geter Siete sceria e Bre WE Moe ere“: 6 acaba chee ae Wielp 868 Ge. eVe. Said aera © pve W/eua eles are we este 8; 676i B (Sele serat ayes —3+3dB (100Hz)
-—12+6dB (4kHz)
TAPE PLAYER
Tape
Speed
(MTT-111)
ccccect
cece
ee
ee
tet
tenes
een
e
rete
en
eeeenee
eee
eneeeeeneeeneaees
4.76cm/sec.
+3%
to
-1%
Wow
&
Flutter
CIS,
WRMS/MTT-111)
cccceceecece
eee
e
ee
eee
eee
e
ener
ne
ene err
e
errr
teen
eee
E
eee EEE EEE Ee
Ee
0.25%
SN
Ratio
(MTT-112)
ceecce
cette
tere
eee
eee
e
eee ence
eeeeesenseeeenseneeeeneeeeaes
50dB
(7279M//L
Models
Only)
52dB
(7279E
Model
Only)
Distortion
(MTT-118)
ee
eee
i
ie
ee
rd
2%
Frequency
Response
(Ref.
1kHz,
MTT-256)
csrrcsreceeerreeeeee
63Hz
—3dB
to
10kHz
-—3dB
(7279E
Model
Only)
(Ref.
1kHz,
MTT-356)
srrrrserre
ree
63Hz
—5dB
to
10kHz
—3dB
(7279M/L
Models
Only)
Separation
(MTT-141)
cceccece
reece
ere
e
cece
ere
eee e
nee
e
teense
eens
eeeene
sent
ener
eee
s
eens
eee
nee tenet
een
e
eee
enes
30dB
Crosstalk
(MTT-1
21)
Se
a
ee
ee
er
er
os
45dB
FF
&
RWD
Time
(C-60)
a
a
ee
ee
a
a
i
ae
a
er
rd
100
sec.
GENERAL
Load
Impedance
are
area
are
re
ee
ee
eam
m
ea
ccc
ccens
4
ohms
(Speaker
Out)
Power
Supply
PP
err
eer
ee
ee
a
re
ee
i
ee
er
rary
14.4V
DC
Power-Output
(10%
T.H.D)
crrrr
rere
r
rere
etter
rere
t
tere
ree eee
e
eee ees
400Hz:
9W/ch
(7279E/M
Models
Only)
1kHz:
9“W/ch
(7279L
Model
Only)
Pre-Output
Voltage
<cccctcre
cree
cece
cree
ete
ee
tenet
eee
teen
ene
e
een
eee
Eten
teen
ee
eee tee
ees
e
tenet
eee tenn
es
1.2V
Chassis
Dimensions
t++tttttrts
ttre
sree
etree
eesess
178
(W)
X50
(H)
x160
(D)
mm
(7279L/M
Models
Only)
178
(W)
x50
(H)
x153
(D)
mm
(7279E
Model
Only)
Nose
Dimensions
<vrrrttr
rts tt
rrr rr
sree
reste
rere
eeeees
176
(W)
x50
(H)
x11
(D)
mm
(7279M/L
Models
Only)
171
(W)
x48
(H)
x15mm
(7279E
Model
Only)
Semiconductors
srrrssrts
ests
reece
9
IC’s,
32
Transistors,
42
Diodes,
10
Zener
Diodes,
1
IFT
(7279E
Model
Only)
12 IC’s, 43 Transistors, 49 Diodes, 13 Zener Diodes, 1 IFT (7279M Model Only)
16 IC’s, 33 Transistors, 40 Diodes, 13 Zener Diodes, 1 IFT (72791 Model Only)
Weight BORN Seeded NSLS ew Bow Bier ane eerie eral ere, ele le S70, 8-6.b Wye ob 0% aie 0. eel ele ea laters Sele els. b a18'R Mie e Ae i ayanes 2 We aidie 1.7kg (7279M/4L Models Only)
1.8kg (7279E Model Only)
NOTE: Due to continuing product improvement, specifications and designs are subject to change without notice.

T279M/L/E
CONTROLS & INDICATORS
a) @)
@® BASS Control
@ TREBle Control
@® EJECT Switch
@ Radio Band Indicator
© Frequency Indicator
Cassette Loading Slot
Memory indicator
Preset Channel indicator
Tape Direction Indicator
FM Stereo Reception Indicator (ST)
PROGRAM/FF & REW Switches
Tuning (DN) Switch
Tuning (UP) Switch
SEEK TUNE Switch
BAND Select Switch
18 Station Preset Switches
BEOeE0®@
)
8
eee
5) 6)
7279M model
SS SSS == SS ts SE,
2) 2dadda a (16) (E) i)
7279L model
7279E model
@ Monaural Indicator (MQ)
@ SDK Indicator (7279M model only)
SK Indicator (7279M model only)
@ LOUDness Indicator
@) DX (Local/Distance) Indicator
@ SEEK Tuning Indicator
@ Monaural Switch (MONO)
@ SDK/LOUDness** Switch (7279M model only)
@ MEMOry Switch
@ DX (Local/Distance) Switch
@ Power on/OFF Switch/VOLume Control/BALance Con- -
trol (Pull)
@ FADer Control
9 Radio Monitor Indicator (R.MONI) (7279L/E models only)
4) R.MONI/LOUDness** Switch 7279L/E models only)

CONNECTIONS
OPERATION
——_ «Antenna Receptacle
= ——— ES)
White/Black a . Left Speaker Output Lead common)
— ee,
Gray/Black aoe = Right Speaker Output Lead {common}
ne Left Front Speaker Output Lead
| Whrte _
—— eS) Right Front Speaker Output Lead
Grey —
SE CES Left Rear Speaker Output Lead
| Green —_—
eS Right Rear Speaker Output Lead
Blue/Whre —_
Remote ON Lead
Red —
fae © ACC Power Lead
—s
Lc
ee
Baiery
lesa
Ground Lead
ist
id
‘TAPE PLAYER OPERATION>
1.
Turn the power on by rotating the VOLume control/power
switch @ clockwise. With the tapa opening to the right, in-
sert the cassette into the loading slot as far as it will go. One
of the tape direction indicators @ will light and the tape will
Start playing.
If a metal or CrO, cassette tape is inserted, the tape mecha-
nism automatically sets itself for 70ssec equalization.
Adjust VOLume @, BASS @, TREBle @, BALance 4 and
FADer 2 controls to suit your listening preference. Tape re-
verses automatically at the end of the tape to play the other
side.
Tochange from side A to play side B or vice versa before the
end of the tape is reached, press the PROGRAM switch 4).
To stop tape play, press the EJECT switch ®.
Toturn the power OFF, fully rotate the VOLume control coun-
terclockwise.
Winding the Tape Rapidly in Forward or Reverse Direction
dh
2
3.
Press the PROGRAM Switch ( 44 or »» button) 6) until it
locks and the tape will run rapidly in the designated direction.
Lightly press the other button to stop. the Fast Winding
mode. The tape will start playing again.
When the Fast Winding operation reaches the end of the
tape, the mode will automatically switch to playback.
AUTO PAUSE
When the unit is removed from its bracket, it automatically goes
into the Tape Pause Mode, the tape disengages from the cap-
stan and pinch roller. When the unit is re-inserted into the brack-
et, tape play will resume from the point in which it was stopped.
Key-off Pause
If the ignition is turned off while a cassette is playing, the tape
disengaqas from the tapa head, capstan, and pinch roller, but
the cassette remains in the cassette compartment with the cas-
sette door completely closed. When the ignition switch is
turned on again, playback will begin from the point where it was
left off.
i Violet _ Right
5 Red Output RCA Type Connector
Left
White
Blue
Power Antenna Lead
727T9M/L/E
Output RCA Type connectors
RCA type connectors are for connecting the unit to
an unit having RCA type input terminals.
Power Antenna Lead
Connect the power antenna control lead (Blue) to the
connector of full automatic power antenna. Power
antenna control does not work with semi-automatic
or manually operated antenna.
ACC Power Lead
This lead is to be connected to an ignition terminal in
the vehicle’s fuse box or a terminal which develops
+ 12 V when the ignition is turned on.
Remote ON Lead
If the unit is connected to your Amp unit with RCA
jacks, connect the remote ON lead to the male con-
nector of the unit remote ON lead.
CAUTION:
Before connecting any wire, set the volume level to
minimum by turning the power ON/OFF switch knob
counterclockwise.
Radio Monitor (7279L/E models only)
Pushing the RADIO MONITOR/LOUDNESS switch @, Radio
Monitor is activated and R MONI indicator @ will light, you can
receive the last tuned station or operate seek tuning UP @3 and
DOWN 42. Push this switch for 3 seconds or more to activate
LOUDNESS function; LOUD indicator lights up. Low frequency
sound will be boosted at low sound contents. Push the switch
again for 3 seconds or more to release the function.
«RADIO OPERATION»
MANUAL and AUTOMATIC SEEK TUNING (7279M/L models
only)
The radio does not operate in the tape play mode. Tolisten to the
radio, eject the cassette by pressing the EJECT switch @).
Pressing the EJECT switch ® during tape play causes the tape
in the loading slot to be ejected.
1. Turn on the power by turning the VOLume control/Power
OFF switch @ clockwise. Continue to rotate it until the de-
sired volume level is reached.
2.. Push Radio BAND select switch @® for reception of MW/LW
or FM (FM 1 or FM2). The radio BAND Indicator @ will be on,
and the ST [stereo] indicator @ will also be on during FM
stereo reception.
3. Adjust BASS ©, TREBle @, BALance @, and FADer @ con-
trols to their center positions.
4. To automatically tune, press the SEEK TUNE button 19 and
then either UP or DN tuning button. The SEEK indicator @ ap-
pears on the display and the frequency changes to indicate
that the radio is in the auto SEEK tuning mode and ready to
stop at every strong station. Repeat the procedure until your
desired station is obtained. When the radio reaches the up-
per or lower end of the band, it automatically starts scanning
in the opposite direction. To return to manual tuning, press
the SEEK TUNE button again, the SEEK indicator disappears.
5. Tomanually tune, press the Tuning Switch (UP) 43 for higher
frequency broadcasts, and press the Tuning Switch (DN)
for lower frequency broadcasts.
Sabi

-7279M/LYE
6. Adjust VOLume 22, BASS “D, TREBle ©, BALance 2”, and
FADer 28, to suit your listening preference.
7. To switch from FM to MW/LW or vice versa press the BAND
select switch 1.
Memory Operation (7279M/L models only)
1. Select FM1, FM2, or MW/LW by pressing the BAND select
switch 49.
2. Select a station manually or by SEEK tuning.
3. Press the MEMOry switch 2. The memory indicator @ will
light.
4. Press a Station Preset switch to preset the station in MEMO-
RY.
5. Repeat steps 2, 3 and 4 to preset up to 6 stations per band
(FM1, FM2 or MW/LW) total 24 stations. Press one of the
unused Station Preset switches 48 each time.
6. Press the Radio Band select switch @ to preset six stations
on another band. Follow Steps 2, 3, 4, and 5. Remember,
there are altogether four (FM1, FM2, and MW/LW) bands.
7. To tune in a frequency programmed into memory, press the
desired station preset switch, 1 through 6. If the radio is set
to MW/LW, you'll receive an MW/LW frequency. If in the
FM mode, you'll receive an FM.
8. Adjust VOLume 4, BASS @, TREBle @, BALance @, and
FADer 48, to suit your listening preference.
MANUAL and AUTOMATIC SEEK TUNING (7279E model only)
The radio does not operate in the tape play mode. To listen to the ra-
dio, eject the cassette by pressing the EJECT switch ®.
1. Turn on the power by turning the VOLume control/Power OFF
switch @ clockwise. Continue to rotate it until the desired vo-
lume level is reached.
2. Push Radio BAND select switch @ for reception of AM or FM
(FM 1 or FM2). The radio band Indicator ® will be on, and the ST
[stereo] indicator ( will also be on during FM stereo reception.
3. Adjust BASS ©, TREBle @, BALance @, and FADer @ controls
to their center positions.
4. To automatically tune, press the SEEK TUNE button @ and then
either UP or DN tuning button. The SEEK indicator @ appears on
the display and the frequency changes to indicate that the radio
is in the auto SEEK tuning mode and ready to stop at every strong
Station. Press the tuning button until your desired station is ob-
tained. When the radio reaches the upper of lower end of the
band, it automatically starts scanning in the opposite direction.
To return to manual tuning, press the SEEK TUNE button again,
the SEEK indicator disappears.
5. To manually tune, press the Tuning Switch (UP)@ for higher fre-
quency broadcasts, and press the Tuning Switch (DN) @2 for low-
er frequency broadcasts.
6. Adjust VOLume@, BASS ©, TREBle @, BALance @, and FADer
@, to suit your listening preference.
7. To switch from FM to AM or vice versa press the BAND select
switch @.
Memory Operation (7279E model only)
1. Select FM1, FM2, or AM by pressing the BAND select switch @.
2. Select a station manually or by SEEK tuning.
3. Press the MEMOry switch @. The memory indicator will light.
4. Press a Station Preset switch to preset the station in MEMORY.
5. Repeat steps 2, 3 and 4 to preset up to 6 stations per band (FM1,
FM2 or AM) total 18 stations. Press one of the unused Station
Preset switches 4 each time.
6. Press the Radio Band select switch @ to preset six stations on
another band. Follow Steps 2, 3, 4, and5. Remember, there are
altogether three (FM1, FM2, and AM) bands.
7. To tune ina frequency programmed into memory, press the de-
sired station preset switch, 1 through 6. if the radio is set to AM,
you Il receive an AM frequency. If in the FM mode, you’ llreceive
an FM.
8. Adjust VOLume@, BASS ®, TREBle D, BALance @, and FADer
@, to suit your listening preference.
FM STEREO/MONAURAL Selection (MONO Switch}
During stereo reception, should the signal level become weak
(the “ST” indicator 40 in the display blinks), select monaural re-
ception by pressing the MONO switch @ to decrease noise le-
vel.
NOTE: Monaural mode has been setinitially. Push the MONO
switch 23 when a stereo broadcast is being received.
Local/Distance Switch Operation
You may select local or distance mode during SEEK tuning
When it is in the local mode (Distance (DX) indicator 4? is off), it
allows you to tune in strong signal stations only (stutions C, F, H
and L as shown below). When it is in the distance mode (Dis-
tance (DX) indicator ts on), weak and strong signal stations
(stations from A through M) will be tuned in.
Once a station is tuned in by SEEK in local mode, the mode will
automatically switch to distance mode for optimum reception.
Signal strength
=> ao
Frequency
NOTE: Dx (Local/Distance) Switch 28 functions only in SEEK
tuning.
Traffic Information Receiving (7279M model only)
This model is equipped with traffic information receiving appara-
tus to be used in West Germany where the traffic information is
broadcast in FM. The following is how to use this unit to receive
traffic information broadcasting.
1. Select FM position.
2. Depress the SDK switch and tune toa Station. If the station is
a traffic information station, the SK indicator will glow and
show the reception of a broadcast from a traffic information
station.
NOTE: SK Indicator
When SK signal is received irrespective of the SDK position,
the SK indicator will illuminate.
3. In the SDK mode, stations other than traffic information
stations are muted and cut out. Therefore, itis easy to select
a traffic information station.
4. As the signal of the tuned traffic information station becomes
weak, the SK indicator will extinguish, then after the lapse of
30 seconds, a rhythmical alarm will sound to urge retuning to
another stronger Station. If the reception of further traffic in-
formation is required, tune in the desired traffic information
Station. When received, the alarm will stop and the SK indi-
cator illuminates. Since the alarm will continue if no signals
from any other traffic stations can be received, release SDK
switch for the reception of normal broadcasting.
5. When the unit is playing a cassette tape with the SDK switch
pushed in and tuned to a traffic information station, the tape
play is interrupted and changed to FM radio if the pre-tuned
Station begins a traffic information message. When the
message is over, the unit reverts to tape play automatically.
6. Even if the VOLUME control is set to the minimum position,
the volume of the traffic information will be automatically ad-
justed to proper level. After the message, the sound volume
returns to the previously adjusted level.
7. If traffic information reception is no longer necessary, re-
lease SDK switch for normal radio reception.

727M /“L/E
Disassembly Instructions
1. Removal of Nosepiece
(1) After removal of bracket handle, top cover and
bottom cover, remove two control knobs (Volume,
(Top Slide)
Balance) and two slide knobs as shown in Figure
1.
(2) Remove two screws marked “O” and two hooks
(A) as shown in Figures 1 and 2.
(Bottom
Side)
Nosepiece
Slide Knobs
Nosepiece
Control Knobs (Volume, Balance)
Figure 1
Figure 2
Hook (A)
2. Removal of Cassette Deck
(1) After removal of nosepiece, remove four screws
marked “xX” as shown in Figures 1 and 3.
(2) Disconnect one connector from the cassette deck. x
SDK P. C. Board
(7279M Model Only)
Switching P. C. Board
Cassette Deck (7279L Model Only)
T aoGs
Tone
P.
C.
Board
uner
P.
C.
Board
(7278M/L Models Only)
Figure 3
3. Removal of Front P. C. Board
(1) After removal of cassette deck, remove two screws
marked “O” as shown in Figure 4.
(2) Remove the solder (c) as shown in Figure 6.
(3) Disconnect one wire from the Front P. C. Board.
Note :Do not cut parallel wires from the Main P.
C. Board by removing the solder (c).
Nut © Figure 4

| 727T9M/L/E
4. Removal of Tuner P. C. Board
(1)
Remove
the
solder
(b)
as
shown
in
Figure
6.
5.
Removal
of
Tone
P.
C.
Board
(7279M//L
Models
Only)
(1)
After
removal
of
cassette
deck,
remove
the
solder
(d)
as
shown
in
Figure
6.
(2)
Disconnect
two
connectors
from
the
Tone
P.
C.
Board.
6.
Removal
of
SDK
P;
CG.
Board
(7279M
Model
Only)
(1)
Remove
the
solder
(e)
and
(f)
as
shown
in
Figure
6.
Rear
Chassis
A
QRB
Connector
(Socket)
7.
Removal
of
Swithching
P.
C.
Board
(7279L
Model
Only)
Figure
5
(1)
Remove
the
solder
(f)
as
shown
in
Figure
6.
Hook (B) Solder (a) Hook (B)
Solder (e)
(7279M Model Only)
Solder (a)
(7279M/L Models Only)
Solder (b) r ae a
k
Tig
pee
Paths
—
Main
P.
C.
Board
Solder
(f)
fa
hs
ae
tit
(7279M//L
Models
Only)
Tony
“ne
ees
Bie
R
yo
eae
mor
—
“Oris
YY
sega
Solder
(d)
Solder (b)
(7279M/L Models Only)
Front P. C. Board
Solder (c)
8.
Removal
of
Main
P.
C.
Board
Pataller,
wyres
Figure
6
(1)-1
After
removals
of
Front
P.
C.
Board
and
Tuner
P.
C.
Board,
remove
the
solder
(a)
as
shown
in
Figure
6.
(7279E
Model
Only)
(1)-2
After
removals
of
Front
P.
C.
Board,
Tuner
P.
C.
Board,
Tone
P.
C.
Board
SDK
P.
C.
Board,
remove
the
soder
(a)
as
shown
in
Figure
6.
(7279M
Model
Only)
(1)-3
After
removals
of
Front
P.
C.
Board,
Tuner
P.
C.
Board,
Tone
P.
C.
Board
and
Switching
P.
C.
Board,
remove
the
solder
(a)
as
shown
in
Figure
6.
(7279L
Model
Only)
(2)
Remove
a
nut
and
two
hooks
(8)
as
shown
in
Figure
4
and
6.
(3)
Remove
five
screws
marked
“A”
as
shown
in
Figure
5
and
6.
(4)
Disconnect
all
wires
from
the
Main
P.
C.
Board,

rere
Adjustment Procedures
1. AM SECTION
(1) Dummy Antenna Circuit
1
Input ' 65pF : Output
| : 1 1
r3 | es a
For
50
ohms
AM
Signal
Generator
Figure
7
(2)
Connections
Antenna
Receptacle
AC
Voltmeter
AM
Signal
Generator
AM Dummy
Antenna
Unit Under Test Figure 8
DC Digital Figure 9
Unit Under Test
Voltmeter
(3) Location of Adjustment Parts
See Adjustment Locations.
(4) Control Settings
Power Switch -cecccrce tre rect e eee eet eees ON Balance Control ----:s+err eres Mechanical Center
FMZAM Switch vrrtre reser e eter e ere cece eee e es AM Treble/Bass Control -++++++++-- Mechanical Center
Others ec i ee a a er ee ee OFF Fader Control pee n reer reese eres coencs Front Position
(5) Adjustment Procedures (7279E Model Only)
i rl
Si Co oo
ps [eee me] | ome
[Tome [ewe | nomen | oom [RT em
[mie ewe] wire

' 7279M/L/E
(5} Adjustment Procedures (7279ML Models Only)
a
2. SDK Section (7279M Model Only)
(1) Dummy Antenna
ed
For 50 ohms FM Signal Generator Figure 10
(2) Connections
DC Voltmeter
Antenna Receptacle
FM Signal Generator
Antenna
Figure 11
(3) Control Settings
Power Switch crrssssser sets s ete cece e cece eens ON Treble/Bass Controls ----+:+--- Mechanical Center
Band Select Switch -cccececeec ese cee reese eees SDK Fader Control «sreseererec eect eeees Front Position
Balance Control ---++++erse seers Mechanical Center Other: 2550s le Savi one tales ela since oD OFF
(4) Adjustment Procedures
Signal Generator Dial Control Adjustment
7 ee
DK Adjustment
98.1MHz, 20dB zu
(SK, BK: ON DK: OFF)
L601 for Maximum Output of
T.P.10.
98.1MHz
98.1MHz, 66dB u
(SK, BK, DK : ON)
VR601 for Maximum Output of
T.Ps11.
98.1MHz
—10—

7279M/L/E
3. FM SECTION
(1) Dummy Antenna Circuit To ohms 45 ‘ohms!
1
Input ! 60 ohms Output
1 1
bt St goes a
For 50 ohms FM Signal Generator Figure 12
(2) Connections
Antenna
Receptacle
DC
Voltmeter
FM Signal Generator }
FM Dummy
Antenna
AC VTVM
= Unit Under Test
Figure 13
Antenna Receptacle
FM Signal Generator
FM Dummy
Antenna
FM
Stereo
=>
=
Unit
Under
test
Oscilloscope
Modulator
;
Figure
14
AC
VTVM
Antenna Receptacle
ieee FM Dummy
° II Antenna
FM Stereo
Modulator
Unit Under
Test
Figure 15
FM Signal Generator Antenna Receptacle
FM Dummy
Antenna
Ground
= Unit Under Test
Figure 16
Antenna Receptacle
Ground
Unit Under Test
(7279E Model Only)
Figure 17
(3) Location of Adjustment Parts
See Adjustment Locations.
—-11—

| 7279M/L/E
(4) Control Settings
Power Switch -rrrrrrcctsr tress erect sees ecees ON Balance Control -++++++++s+eeeee- Mechanical Center
FM/AM Switch corres rset reste eters eter eec cee FM Treble/Bass Control ---+++-++-- Mechanical Center
Others ccc c cree sree sere ete eee c eee cece nee OFF Fader Control «ccc ce teeter cree reece Front Position
VR4 (7279E), VRS (7279M/L)
for minimum at L (R) channel
output.
Adjust VR2 for the waveform
changing from Low to High.
98.1MHz, 66dB zu Confirm to receiving signal.
: : T2 (7279E), T4 (7279M/L)
1 IF Adjustment Figure 13 98.1MHz for OV+0.03V between T.P3
and 4.
(Mono Signal, :
L
Signal
for
842dB
Separation.
Seek Stop ;
.1MH
Adjustment eS.iMbis
98.1MHz, 66dB u
(Mod. 400Hz,
G
(Mono
Signal,
2
VCO
Adjustment
Figure
16
98.1MHz
VR3
for
19+0.2kHz
curve
at
No
Modulation)
98.1MHz,
20dB
u
ce
|
eee
ae
Noise
Level
Dev.
22.5kHz)
put
(5) Adjustment Procedures
No Modulation)
98.1MHz, 66dB u
T.P.5.
Separation : 98.1MHz, 66dB », 1,000Hz
Adjustment AL): Signal, Modulgtion: |. 22°! Mh?
VR201-1, 2 (7279E)
ara eedee 98.1MHz | VR302-1, 2 (7279M//L)
FM Stereo Blend Figure 15 igna (VOLUME) for 2V at Lch. output.
Adjustment
98.1MHz, 46dB p 98.1MHz VR1 (7279E), VR4 (7279M/L)
Mono Signal,
No Modulation
Adjustment 98.1MHz, —10dB u = =
(Mod. 400Hz 98.1MHz VR1 for -25 to —35dB at Lch
Dev. 22.5kHz) output
*KSteop Geeess 7279M/L Model Only.
Figure 14
4.
TAPE
SECTION
AC
Voltmeter
(1)
Connection
Test
Tape
Unit
Under
Test
(2)
Location
of
Adjustment
parts
Figure
18
See Adjustment Locations
(3) Control Settings
Power Switch <scrcsctrrcr reer rrr tr cere reser ON Treble/Bass Control «+++++++++> Mechanical Center
Fader Control Periyar er arr ar rarer ae Front Position Others TREE Ee OR ee eC ee RR OFF
Balance Control -sr++sssteeeeeeee Mechanical Center
(4) Adjustment Procedures
Test Tape Test Point | Adjustment Point Adjustment
1
Head Azimuth | MTT-114NB ; Head Azimuth Adjust for maximum and same
: Figure 18 Adjustment Screw | level output at normal and
Adjustment (14kHz)
(Figure 19) reverse positions.
MTT-111
i 18
Tape Speed
Adjustment Volume} 3,030—3,080Hz
(Figure 20)
Tape Speed
Adjustment
—12-—-

Adjustment Locations
Playback head
Head azimuth
ajustment screws
Figure 19
SDK P. C. Board (Top View)
(7279M Model Only)
—~13-
Tape speed adjustment
Figure 20
Tone P. C. Board (Top View)
(7279M/L Models Only)
7T278M/L/E
Motor

7279M/L/E
=
(Top View)
. Board
(7279E Model Only)
Cc in P Ma
~14—

| 7279M/L/E
180k ohms
Tuner P. C. Board (Top View)
(7279 Model Only)
Radio P. C Board (Top View)
(7279M/L Models Only)
180k ohms
~15—

T2TIM/L/E|
FM
Tuner Schematic Diagram
(7279M/L Models Only)
Lo/ox (3)
%& R2002
100K
12001
C2009] C2010
CCF 2001
820
CoO O®
c2010 2018 Samm S amt 4 em 3) 2) 1) )m9)
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2 .01
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C2011
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2015
C2016
474
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NOTE: PARTS MARKED * ARE FOR ADJUSTMENT.
~16—
(6) F OUT
(8) IF OUT
t—@) IF OUT
R2011 C2021

7279M/L/E
(7279M/L Models Only)
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Parts
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P.C.
Boards
and
Wiring
Diagram
(1/2)
©7279M.“L
Models
Only
7279L Mode
mm.
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7279M Model ( After 80511501
= 7279L Model ( Before 80510123)
7279M Model ( Before 80511500)
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—20—
—19—

7279M/L/E
1/2)
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Models
Only
Assy, QRB Connector
2: inde tains OO
Cer NI
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YEL{PEMCTE) \ +
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7279M Model ( Betore 80511500!
i... GT Control PC.Board
Js
aati
-- Yellow
- Pink
-- Violet
++ Green/White
+ Shield
- Gray “White
- Gray “Yellow
-Green/Yellow
GRN/WHT ---*
GRY “WHT
GRY /YEL
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—~20—